A fatty tumor, also known as a lipoma, is a noncancerous tumor made up of fat cells that grows just under the skin. Lipomas can take up to several years to grow noticeable, according to DermNet. They can reach up to 10 centimeters and appear wherever fat tissue is present.
Fatty tumors are often caused by genetics, but can develop due to minor injuries, according to Wake Forest Baptist Health. Fatty tumors are typically harmless but should be checked by a doctor to confirm that they are not something more serious.
As of 2015, doctors do not know the cause of fatty tumors, or lipomas, in humans, according to Healthline. Fatty tumors tend to run in families, so there is likely a genetic component.
A fatty tumor on the kidney, called angiomyolipoma, is a benign mass composed of fat, blood vessels and smooth muscle. A benign tumor is noncancerous and cannot metastasize or spread to other parts of the body but it can grow and destroy other tissue, according to the Canadian Cancer Society.
Most people develop fatty liver disease, also called steatosis, by drinking excessive amounts of alcohol regularly, reports Healthline. The disease also results from inherited metabolic disorders, excessive use of medications or toxins. Fatty liver occurs when the body produces too much fat or fails
Fatigue, weight loss and weakness may be associated with fatty liver disease, but many times, there are no symptoms, especially when it starts, according to WebMD. Fatty liver disease can take several years or even decades to advance.
As of February 2015, scientists do not know exactly what causes nonalcoholic fatty liver disease, explains Mayo Clinic. People with alcoholic fatty liver develop the condition due the effects of enzymes involved in alcohol metabolism, notes the Cleveland Clinic.
When a person has fatty liver, over 5 or 10 percent of the weight of his liver consists of fat. Fatty liver is not necessarily dangerous as long as damage or inflammation do not occur, explains WebMD.
Fatty liver disease is characterized by the buildup of fat in the liver; it can be classified as alcoholic liver disease, or ALD, or nonalcoholic fatty liver disease, or NAFLD, as stated by WebMD. Both conditions can lead to serious complications.
The primary sign of a fatty cyst, also known as a lipoma, is a soft, rubbery and small movable bump that can be felt under the skin, explains WebMD. Fatty cysts do not cause pain and typically do not enlarge, but the cysts may grow slowly.